A wise comment from a SiC in the rough.................. Doug Pauls "Whittaker, Dewey (EHCOE)" <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 06/11/2010 01:52 PM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to "Whittaker, Dewey (EHCOE)" <[log in to unmask]> To [log in to unmask] cc Subject Re: [TN] Weird formation of voids It's always good to get a view from a cross-section of our Industry, regardless of how well polished it was or not. Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of stephen gregory Sent: Friday, June 11, 2010 8:21 AM To: [log in to unmask] Subject: Re: [TN] Weird formation of voids Hi Bev! Got your picture today, and have it posted now: http://stevezeva.homestead.com/Bevs_Ball.jpg Almost looks like little pieces of dross. I wonder if something is going on with the solder paste? Or leaded reflow profile with a lead-free BGA? Steve --- On Wed, 6/9/10, Bev Christian <[log in to unmask]> wrote: From: Bev Christian <[log in to unmask]> Subject: [TN] Weird formation of voids To: [log in to unmask] Date: Wednesday, June 9, 2010, 9:51 AM TechNetters, I am sending a picture to Steve to post. I have labs in three locations. One of them has seen weird voids in cross-sections of BGAs while the other two locations have not. For the lab that has seen them, the cross-sections were prepared by different people on different days for different products, using the same equipment. The voids are not in all balls cross-sectioned but may be only in one of two of the balls in a row of multiple solder joints examined. Have you seen anything like this? Do you know the root cause? Vlad, You know what is going on, so please don't respond. Bev --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------